<template>
    <div class="login">
        <div class="login_box">
          <div class="avatar_box">
            <img src="../assets/logo.png" alt="">
          </div>
          <el-form ref="loginFormRef" class="login_form" :model="loginForm" :rules="rules">
            <el-form-item prop="username">
              <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
            </el-form-item>
            <el-form-item prop="password">
              <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password">
              </el-input>
            </el-form-item>
            <el-form-item class="btns">
              <el-button type="primary" @click="login">登录</el-button>
              <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
          </el-form>
        </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      rules: {
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur' },
          { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 5, max: 10, message: '长度在 6 到 10 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败!')
        this.$message.success('登录成功!')
        // 1、将登陆成功之后的token, 保存到客户端的sessionStorage中; localStorage中是持久化的保存
        //   1.1 项目中出现了登录之外的其他API接口，必须在登陆之后才能访问
        //   1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 2、通过编程式导航跳转到后台主页, 路由地址为：/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="scss" scoped>
.login{
  height: 100%;
  background: skyblue;
  .login_box{
    width: 450px;
    height: 300px;
    background: #fff;
    position: relative;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);

    .avatar_box{
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      position: absolute;
      left: 50%;
      transform: translate(-50%,-50%);
      background-color: #fff;
      box-shadow: 0 0 10px #ddd;
      img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }

    .login_form{
      width: 100%;
      position: absolute;
      bottom: 0;
      padding: 0 20px;
      box-sizing: border-box;
      .btns{
        display: flex;
        justify-content: flex-end;
      }
    }
  }
}
</style>
